反应详情

温度

100 °C

Under a nitrogen atmosphere, to a solution of 1.0 g of 1-(4-bromo-2-nitrophenyl)butane-1,3-dione in 10 ml of acetic acid was added 501 mg of cyclopentylhydrazine hydrochloride, followed by stirring at 100° C. for 1 hour and 30 minutes. The reaction mixture was concentrated, and to the obtained residue was added ethyl acetate. The solution was washed with a saturated aqueous sodium hydrogen carbonate solution and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and then the residue was purified by silica gel column chromatography (chloroform/methanol) to obtain 770 mg of 5-(4-bromo-2-nitrophenyl)-1-cyclopentyl-3-methyl-1H-pyrazole.

1. concentrationThe reaction mixture was concentrated
2. additionto the obtained residue was added ethyl acetate
3. washThe solution was washed with a saturated aqueous sodium hydrogen carbonate solution and saturated brine
4. dry with materialdried over anhydrous magnesium sulfate
5. customThe solvent was evaporated under reduced pressure
6. customthe residue was purified by silica gel column chromatography (chloroform/methanol)